FÜR DIE ZUKUNFT GEDACHT.
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Pagoda roofs at the Baltic Sea shore“Exceptional, intense and very attractive”
would be the words to describe the
restaurant “Wolkenlos” at the end of the
promenade pier “Seeschlösschenbrücke”
in Timmendorf, Germany, which opened
in summer 2014. The completion of the
Asian-style building also put an aestheti-
cally very pleasing end to a long lasting
story.
Roofs like playful wavesWhat was meant as a well-intentioned
gift from the patron Jürgen Hunke to the
municipality of Timmendorf, caused
disagreement and dispute for a couple of
years. The initial concept was to build a
“House of Arts” in the style of an Asian
teahouse, preferably at the end of a
promenade pier. So what would be more
obvious than to use the ailing “See-
schlösschenbrücke” for this extraordinary
project. In 2009, the tourism and building
committee planned to dismantle and to
rebuild exactly that very pier. At the pier
head, an Asian-style teahouse, funded
by Jürgen Hunke, was to be erected on a
36 by 16 metre platform.
Not all Timmendorf citizens agreed to
such a rather untypical architectural style
for this region. In 2013, the deadlock
began to resolve. The pier, the platform
and the “Mikado Teahouse” were built,
the latter according to a project of the
Hamburg architect Andreas Schuberth.
“Inspired by the sea”, Schuberth con-
firmed, “the metamorphosis resulted in
an Asian-style roof, in playful waves.”
Sophisticated roof styleThe untypical roof style was also a
particular challenge for the involved
roofers. While the range of services of
the carpentry company Holzbau Hargus
GmbH from Timmendorf already includes
some special features, pagoda roofs
are not exactly among them. Especially,
two-tiered roofs like for this teahouse.
While the upper pagoda roof covers the
stacked storey, the lower one protects
the ground floor with its wide circum-
ferential overhang. Furthermore, both
roofs are without any gutters. That is,
why the roof waterproofing itself is even
more important. It has not only to be sea-
waterproof, but must first of all resist
wind uplift. The complete waterproofing
of both roof areas was carried out by
E. Ammen GmbH from Ratekau.
“Mikado Teahouse” at the promenade pier “Seeschlösschenbrücke” in Timmendorf, Germany
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White, sweeping airinessAccording to the architect, the extraordinary
roof design should be accentuated by a
homogeneous white waterproofing. As a
roofing material, the designer therefore
selected the waterproofing membrane
EVALON® VSK from alwitra GmbH, Trier,
Germany. Being one of the first manufac-
turers of white synthetic waterproofing
membranes, alwitra is the most experienced
company in this respect. Furthermore,
the installed waterproofing membrane
is equipped with a lower self-adhesive
coating significantly facilitating the
handling on the three-dimensional
substrate.
Reliable with self-adhesive coatingEVALON® VSK integrates the best char-
acteristics and advantages of the tested
and proven waterproofing membranes
EVALON® with the additional possibility
of full-size bonding. The waterproofing
membrane can be used for both new build
and refurbishment. The homogeneous
waterproofing layer of the membrane is
equipped with a polyester fleece backing,
reducing stress and strain on the system
after laying (vapour decompression,
movement compensation etc.) At the
factory, the synthetic adhesive compound
coating is covered with a release film.
Besides, the waterproofing membrane
has a welding edge on one side for
reliable membrane connection using hot
air or solvent-welding agent.
Thanks to this lower self-adhesive coating,
laying is extremely time-efficient and clean.
Even with self-adhesive coating the water-
proofing membrane allows diffusion. Since
fixing the membrane is achieved by cold
bonded application without open flame
there is no fire hazard.
In addition to the CE marking as water-
proofing membranes according to EN 13956
and EN 13967, for all EVALON® membranes
comprehensive Environmental Product
Declarations (EPD) are available, issued by
the renowned Institute Bauen und Umwelt
(IBU).
Professional installation of typical
individual roof elements is supported
by a wide variety of accessories and
preformed details. It includes e.g.
EVALON® self-adhesive tapes, expansion
joint tapes, rainwater outlets or sleeves
for roof penetrations. Not least, EVALON®
coated metal sheets allow for optimum
flashing against critical elements.
White, sweeping airiness
FÜR DIE ZUKUNFT GEDACHT.
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Double-layer pre-deckingFor trimming the edges of the pagoda
roofs of the Timmendorf teahouse, again
EVALON® coated metal sheets were
used. However, prior to that the structure
including the rough-sawn formwork
boarding had to be protected against
wind and weather. Therefore, the team
of master roofer Andreas Konrad nailed
a bituminous waterproofing directly to
the formwork. For a smooth surface, the
sheets were butt-joined. This installa-
tion method required a second layer of
self-adhesive bituminous sheets, laid in
a staggered pattern with butt joints.
Continuous waterproofing membranesAn EVALON® system pre-coat/primer was
applied to the surface of the self-adhesive
bituminous sheets in order to facilitate
bonding of the waterproofing membrane
EVALON® VSK. Subsequently, the individual
EVALON® VSK membranes were applied.
Due to the form of the roof, installation
was carried out from the ridge to the
eaves. First, the roofers cut to length the
individual membranes in order to achieve
a homogeneous installation pattern
without any short-end joints. Then they
rolled out the membrane from the ridge
to the eaves and removed the factory-
applied release film. The membrane was
dynamically pressed on to the substrate
from the ridge to the eaves. Always two
roofers cared for sufficient tension of
the membrane to avoid folds or buckles.
The overlapping membrane seams were
welded with hot air. In order not to soil
the membranes during installation,
the roofers who worked directly on the
EVALON® waterproofing membranes
even changed their footwear. At the
circumferential roof edges, the roofers let
the membranes protrude for an unprob-
lematic trimming of the roof edge after
completing the roof area waterproofing.
Field fasteners against wind upliftThe architect‘s design envisaged a plain
white roof surface without any visual
discontinuation. However, for practical
reasons, this could not be achieved. Due
to the exposed location and the expected
wind loads, the waterproofing area had
to be additionally secured with field
fasteners. The roofers placed them in a
symmetric regular pattern designed by
the architect so that they would harmoni-
cally fit in with the overall picture and
almost be invisible. How necessary these
additional fasteners were, the roofers
experienced themselves during instal-
lation in November 2013. Wind at times
exceeding even 160 km/h was measured
at the construction site crane. At such
wind speeds, no roofing works could be
carried out. Even at lower wind speeds
the workers on the roof always put on
suitable mansafe equipment.
Professional roof edge trimmingThe roof edges turned out to be a particular
challenge. Creating a homogeneous
visual impression of the roof edge partly
including three-dimensional structures
was a highly demanding task for the
roofers. As already mentioned, EVALON®
coated metal sheets were used for this
purpose. The roofers formed the roof
edge in two phases. First, they formed
Homogeneous roof area due to EVALON® VSK
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a panel with dripping edge arranging
several coated metal sheets in a row.
Instead of welding over the individual
metal sheet joints with EVALON®, the
roofers welded a 20 cm wide EVALON®
tape onto the entire panel length. This
produced a visually continuous surface,
although the metal sheets follow the
curve of the roof edge. The roofers
attached this panel directly to the roof
edge. On top, a second bent coated metal
sheet was installed. One leg of the coated
metal sheet covers a part of the panel, the
second flushes with and is mechanically
fastened to the EVALON® VSK water-
proofing membrane thus preventing wind
blowing under the roof waterproofing.
Then, the roofers welded another 33 cm
wide tape to the coated metal sheets in
the roof area. Thus, rainwater can freely
drain or drip off the roof area over the
edge. Due to their special form, the water
mostly drains off at the lowest points of
the curved pagoda roofs.
Striking promenade pier architecture The teahouse at the Timmendorf beach
with its striking curved white pagoda
roofs, beyond any doubt, is a genuine
architectural treasure, by night dressing
in blue or any other colour by LED light
and turning into a unique gemstone.
Its delicate structure conveys a visual
sense of ease and tranquillity, while
at the same time awakening a certain
longing for the sea and far-away places.
You can get a perfect experience of both
at the restaurant “Wolkenlos” with its
international cuisine of the managing
company Vivaldi Hotelmanagement AG
from Lübeck. No, it has not become a
teahouse at the pier head, however, at
the “Wolkenlos” they stick to the original
idea: different sorts of tea are on offer.
Striking promenade pier architecture
Construction site signInvestor:
municipality of Timmendorf/
Jürgen Hunke
Architect:
Dipl.-Ing. Andreas Schuberth,
schuberth.architekten, Hamburg
Carpentry company:
Holzbau Hargus GmbH,
Timmendorf, Germany
Roofing company:
E. Ammen GmbH, Ratekau
Material:
EVALON® VSK, 1.5 mm,
EVALON® tape,
EVALON® coated metal sheets
Manufacturer:
alwitra Flachdach-Systeme, Trier
8Technical changes reserved
alwitra GmbH & Co.
P. O. Box 3950 . D-54229 Trier
Tel.: +49 651 9102-0 . Fax: +49 651 9102-248
[email protected] . www.alwitra.de
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